I never understand how your penis can be inserted into them mermaids without having some technical difficulty somehow. I bet finding the hole to insert your manhood in will probably take longer then the intercourse itself, lol.
sex with a mermaid is not difficult because the vagina is inside her body and must open when they have sex with a man. you can find this by the lamia too even is the monster male this is the same. this elementary school knowledge from biology.